60 t AOD精炼使用炉料级铬铁冶炼400系不锈钢的生产实践

成分相同的粒度为10~400mm炉料级铬铁比粒度10~60 mm高碳铬铁价格低,但是粒度较大不能通过高仓加料的形式加入AOD内完成合金化。通过分析60 t AOD精炼不锈钢脱碳模型和工业生产实践,采用将炉料级铬铁装在废钢斗内加料的方式,沿用兑铁后加料的操作模型,控制加料前熔池的温度在1550~1600℃,炉料级铬铁替换高碳铬铁加入量在200 kg/t,供氧强度在2.0~2.5 m³/（t·min）能够实现炉料级铬铁一次性加入后操作的稳定和降低成本。

Production Practice of 60 t AOD Using Charge Material Ferrochrome to Refining 400 Series Stainless Steel

The price of size 10 ?400 mm charge material ferrochrome is lower than that of size 10 ~ 60 mm high carbon ferrochrome with same chemical composition, but the charge material with larger size can't be charged in AOD by high level bin to finish alloying. With analysis on 60 t AOD refining stainless steel decarburization model and commercial production practice, the method of charge material ferrochrome adding in scrap charging bucket is used and the operation model to adding material after charging hot metal is adopted with controlling bath liquid temperature 1 550 ?1 600 ℃ before charging, adding 200 kg/1 charge material ferrochromium to replace high carbon ferrochromium and applying oxygen intensity 2.0 ?2. 5 m³/(t · min), the stability of operation with once adding charge material ferrochromium realizes and the cost of production decreases.